// -*- mode: C++; c-indent-level: 4; c-basic-offset: 4; indent-tabs-mode: nil; -*-
//
// Rstreambuf.h: Rcpp R/C++ interface class library -- stream buffer
//
// Copyright (C) 2011 - 2013    Dirk Eddelbuettel, Romain Francois and Jelmer Ypma
//
// This file is part of Rcpp.
//
// Rcpp is free software: you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 2 of the License, or
// (at your option) any later version.
//
// Rcpp is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Rcpp.  If not, see <http://www.gnu.org/licenses/>.

#ifndef RCPP__IOSTREAM__RSTREAMBUF_ALT_H
#define RCPP__IOSTREAM__RSTREAMBUF_ALT_H
#define RCPP__IOSTREAM__RSTREAMBUF_H

#include <cstdio>
#include <iostream>
#include <streambuf>

#include <R.h>

namespace Rcpp {

    template <bool OUTPUT>
    class Rstreambuf : public std::streambuf {
    public:
        Rstreambuf(){}
    	
    protected:
        virtual std::streamsize xsputn(const char *s, std::streamsize n );
        
        virtual int overflow(int c = EOF );
        
        virtual int sync()  ;                             
    };

    template <bool OUTPUT>
    class Rostream : public std::ostream {
        typedef Rstreambuf<OUTPUT> Buffer ; 
        Buffer* buf ;
    public:
        Rostream() : 
            std::ostream( new Buffer ), 
            buf( static_cast<Buffer*>( rdbuf() ) )
        {}
        ~Rostream() { 
            if (buf != NULL) {
                delete buf; 
                buf = NULL;
            }
        }
    };

    template <> inline std::streamsize Rstreambuf<true>::xsputn(const char *s, std::streamsize num ) {
        Rprintf( "%.*s", num, s ) ;
        return num ;
    }
    template <> inline std::streamsize Rstreambuf<false>::xsputn(const char *s, std::streamsize num ) {
        REprintf( "%.*s", num, s ) ; 
        return num ;
    }
    
    template <> inline int Rstreambuf<true>::overflow(int c ) {
      if (c != EOF) Rprintf( "%.1s", &c ) ;
      return c ;
    }
    template <> inline int Rstreambuf<false>::overflow(int c ) {
      if (c != EOF) REprintf( "%.1s", &c ) ;
      return c ;
    }
        
    template <> inline int Rstreambuf<true>::sync(){
        ::R_FlushConsole() ;
        return 0 ;
    }
    template <> inline int Rstreambuf<false>::sync(){
        ::R_FlushConsole() ;
        return 0 ;
    }
#ifndef RCPP_DISABLE_RCOUT
    static Rostream<true>  Rcout;
#endif
#ifndef RCPP_DISABLE_RCERR
    static Rostream<false> Rcerr;
#endif
  
}

#endif // RCPP__IOSTREAM__RSTREAMBUF_ALT_H
